bridqman



(No Model.) I 2 Sheets-Sheet 1. A. BRIDGMAN & J. OHALLO'NER.

WOOD POLISHING MACHINE.

No. 352,988. Patented Nov. 23, 1886.

(No Model.) I 2 Sheets-Sheet- 2. A. BRIDGMAN 85 J. OHALLONER.

WOOD POLISHING MACHINE.

Patented Novr 23, 1886 In vano 17? I 77 zilnesa as N, PETERS.FhnlwLilhogl-mphu, Washinglcn. u. c.

- 'UNITED STATES PATENT -FF1CE.

ORSlTO THE YATES MANUFAGTURIN G COMPANY, OF BERLIN, WIS.

WOOD-POLISHING MACHINE.

QPBCIFICATION forming part of Letters Patent No. 352,988, dated November23, 1886.

Application filed November 12, 1885. Serial No. 182,561. (No model.)

To all whom it may concern.-

Be it known that we, ALMON BRIDGMAN, of Berlin, in Green Lakecounty,'Wisconsin, and J OHN CHALLONER, of OIIII'O, in the county ofWinnebago and State of Wisconsin, have invented new and usefulImprovements in W'ood-Polishing Machines; and we do hereby declare thefollowing to be a full, clear, and exact description of said invention,reference being had to the accompanying drawings, and to letters orfigures 'of reference marked thereon, which form a part of thisspecification.

Our invention, to be hereinafter distinctly claimed, relatestoimprovements in that class of wood-polishing machines adapted tosmooth and polish lumber by the contact therewith of the sand-coveredsurface of a rapidly-rotating.

cylinder; and our invention pertains especially to the construction andmeans for operating this sand-covered cylinder, which is an improvementupon the cylinder secured to us by Letters Patent of the United States,of Sep tember 25, 1883, No. 285,728.

In the accompanying drawings, Figure 1 is a perspective of the cylinderand the attached mechanism for operating it. Fig. 2 is ahorizontalsection of Fig. 1. Fig; 3 is a vertical section of Fig.1. Flg. 4 isacentral crosssection of the cylinder. Figs. 5, 6, and 7are details.Figs. 8' and 9 are perspectives, parts being removed to show other partsmore distinctly.

The same letters refer to like parts in all the views.

The driving-shaftA is supported on and rotates in bearings B B on theframe 0. Motion is communicated to the shaft A by a belt from thepower-supplying mechanism running upon the pulley D, which is rigid onshaft A. The polishing or sand-paper-covered cylinder is supported onand rotates with the drivingshaft A,and consists oftwo sets of radialarms, centrally pierced by shaft A, each set of arms being in pairs, E Eand F F, one set of double arms being at or near each end of thecylinder. These radial arms E E and F F support on their outer ends thesegmental sectional plates G G of the cylinder, upon which the severalsand surfaces are fixed. Each segmental sectional plate is-attached tothe ends (on the same side of the shaft A) of the same set of arms E Eor F F, each set of arms carrying two plates, one diametrically oppositethe other. 1

Along each of the straight longitudinal edges of the several segmentalplates GG is a bar, a, affixed to the armsE E orFF, the outer surface ofwhich bar is a little within the circular contour of the surface of theplates G G, which bar is provided in its outer surfacelongitudinallywith a groove adapted to receive a strip-like keeper, 7).This keeper [2 is held in position by screws or bolts 0 c, passingthrough it and through the bar a into an iron retaining-strap,'d, whichstrap d is supported in mortises in the arms E E or FF and runs justbeneath and parallel, with the bar a.

Over the surface of the plates G G is placed the sand-paper covering,lined or cushioned with carpet and sheets'of rubber, which carpet,rubber, and sheets of sand-paper are held in position by their endsbeing placed beneath thekeeper b b, which are drawn and held down totheir seats by the screws or bolts 0 c. Both sets of arms E E and F Fare provided with rigid collars e and f, respectively surshaft A. Topermit of this reciprocal movement of one set of arms carrying two ofthe sectional segmental plates, the arms E-Eof this set are locatedoutside of and a little distance from the arms F F of the other set, andthe arms E E are each provided with rigid lugs or guides g g, projectinginwardly, which guides g g enter corresponding grooves or recess'es, hh, in the arms F F, which recesses are adapted to receive and permitsaid guides to slide freely therein, whereby while said arms E E arepermitted to reciprocate freely on shaft A they are caused-to rotatewith the arms F F, whichare rigid on the shaft. The

object of this reciprocating movement is to .cause'the microscopic linesmade by the'sandcylinder on the surface of the material being polishedto cross and recross each other, whereby a smoother surface is producedthan could otherwise be obtained. To get this reciprocating movement,weprovide a sleeve,

H, encompassing the shaft A at its end opposite the pulley D, in whichsleeve the shaft rotates freely, and which sleeve in turn rotates freelyin the bearing B. On the outer end of this sleeve H is the fastbandpulley 2', by and through which motion is communicated to the sleevefrom the power-supplying mechanism. On the inner end of the sleeve Histhe collar 3', rigid to the sleeve H, the collar j and pulley i being soadjusted on the sleeve H as not to permit any lateral motion of thesleeve in the bearing B. About the collar j in its periphery there is acontinuous inclined or cam groove, 7a. The arms E and F are eachprovided with an arm, Z, rigid thereto and projecting outwardlytherefrom and diametrically opposite to each other, each of which armscarries on its outer end a swiveled button or traveler, m, adapted toenter and travel in the groove k, by means whereof, when the sleeve Hrevolves somewhat slower or faster than the sand-cylinder, as itisintended to do, the segmental sections of the cylinder are caused toreciprocate laterallyslowly, one set on and the other set with the shaftA.

The segmental sectional plates G G and G G are supported in pairs, eachpair being on the outer ends of the same arms, one plate of each pairopposing or balancing the other plate of the same pair,so that anequilibrium, not only of weight, but of centrifugal motion, will beconstantly maintained. For this purpose we preferably construct ourcylinder in four parts, on two sets of double arms; but the same objectsmight be attained in substantially the same manner by three or more setsof double arms, with a corresponding number of sections or segmentalplates, which would be merely a modification of the form shown in thedrawings.

For convenience in constructing and making repairs, the outer arms, E E,are each made in halves and bolted together at the center, as shown inFigs. 1, 3, and 9. The sleeve H is provided with apertures n n, forlubricating the shaft A therethrough.

WVhatwe claim as new, and desire to secure by Letters-Patent, is-

v 1. In a wood-polishing machine, a rotating polishingcylinder formed inlongitudinal sections, which sections are connected together in pairsrigidly, the sections in each pair being diametrically opposite eachother, and at least one pair of these sections being free to movelongitudinally 011 its driving-shaft, and being connected with mechanismwhereby a reciprocal lateral motion is given to such sections, allsubstantially as described.

2. In a wood-polishing machine, a rotating polishing-cylinder formed inlongitudinal sections in pairs, each of which pairs hasdiametrically-opposite sections, in combination with asleeve, H, havinga cam-groove, is, rotating on the shaft of the cylinder and making lessor more revolutions than the cylinder, said pairs of sections being eachconnected with and guided by said cam, whereby a lateral alternatingreciprocal movement of the pairs of sections is secured, substantiallyas and for the purpose set forth.

3. In a wood-polishing machine, the radial arms F F, in pairs rigid 011shaft A, and provided with recesses h h, in combination with the radialarms E E, sliding on shaft A, and

provided with guides g g, substantially as described.

4. In a wood-polishing machine, the cylinder-carrying driving-shaft A,provided with pulley D, in combination with sleeve H, provided withpulley i and collar j, and the col lar j provided with a cam-groove, 7c,whereby a differential motion between said sleeve and said shaft and areciprocal motion to be given tomechanism connected with said sleeve androtating on said shaft is provided for, all sub-

